[1] : WordNet (r) 2.0

brightness level
     n : the quality of being luminous; emitting or reflecting light;
         "its luminosity is measured relative to that of our sun"
         syn: luminosity, brightness, luminance, luminousness,
          light
see also:
luminosity brightness luminance luminousness light 

Brightness >> B Words
Brightness, definition of term: Brightness
brightness_pag1.html

Level >> L Words
Level, definition of term: Level
level_pag1.html

Level Off >> L Words
Level Off, definition of term: Level Off
level+off_pag1.html

Level Crossing >> L Words
Level Crossing, definition of term: Level Crossing
level+crossing_pag1.html

Sea Level >> S Words
Sea Level, definition of term: Sea Level
sea+level_pag1.html